Method and system for producing synthesis gas

Abstract

A method for producing synthesis gas, including: 1) pre-processing a biomass raw material; 2) pyrolyzing the biomass raw material to yield a pyrolysis gas and a carbon powder; 3) separating the pyrolysis gas from the carbon powder and a solid heat carrier; 4) separating the carbon powder away from the solid heat carrier via a solid-solid separator; 5) conveying the generated pyrolysis gas to a condensate tank for spray condensation, condensing a condensable part in the pyrolysis gas to generate biological fuel oil, pressurizing the generated biological fuel oil by a high pressure oil pump and feeding to a gasification furnace to be gasified; and 6) feeding one part of non-condensable pyrolysis gas to a combustion bed to combust with air, and conveying the other part of the non-condensable pyrolysis gas to the pyrolysis bed as a fluidizing medium.

The invention claimed is: 
     
       1. A method for producing synthesis gas, comprising:
 1) pre-processing a biomass raw material; 
 2) fast pyrolyzing the biomass raw material using a pyrolysis bed having a solid heat carrier to produce a product comprising a pyrolysis gas, a carbon powder, and the solid heat carrier; 
 3) feeding the product obtained in step 2) to a cyclone separator and separating the pyrolysis gas from the carbon powder and the solid heat carrier; 
 4) feeding the carbon powder and the solid heat carrier obtained in step 3) to a solid-solid separator and separating the carbon powder from the solid heat carrier; 
 5) feeding the carbon powder obtained in step 4) to a carbon powder stock bin; 
 6) feeding the solid heat carrier obtained in step 4) to a carrier heating fluidized bed and heating the solid heat carrier, and conveying the solid heat carrier to the pyrolysis bed for recycling use; 
 7) conducting spray, condensation with respect to the pyrolysis gas obtained in step 3) by using a condensate tank to produce a biological fuel oil and a non-condensable pyrolysis gas; 
 8) pressurizing one part of the biological fuel oil obtained in step 7) by using a high pressure oil pump and feeding the one part of the biological fuel oil to a gasification furnace to be gasified; and pressurizing the other part of the biological fuel oil obtained in step 7) by using an oil circulating pump, then cooling the other part of the biological fuel oil by using a biological fuel oil heat exchanger, and then conducting spray condensation with respect to the pyrolysis gas in step 7) by using the other part of the biological fuel oil after cooling thereof; and 
 9) feeding one part of the non-condensable pyrolysis gas obtained in step 8) to a combustion bed to combust with air, and conveying the other part of the non-condensable pyrolysis gas obtained in step 7) to the pyrolysis bed as a fluidizing medium. 
 
     
     
       2. The method of  claim 1 , wherein the spray condensation adopts external circulating method, the one part of the biological fuel oil in step 8) is fed to the biological fuel oil tank before pressurizing the one part of the biological fuel oil in step 8). 
     
     
       3. The method of  claim 2 , wherein waste heat smoke generated in the carrier heating fluidized bed in step 6) is used to dry the biomass raw material in step 1) for pre-processing the biomass raw material. 
     
     
       4. The method of  claim 2 , wherein the pre-processing of the biomass raw material in step 1) comprises: crushing the biomass raw material to have particle sizes of 1-6 mm, and drying the raw material till water content is 10-20 wt. %. 
     
     
       5. The method of  claim 1 , wherein waste heat smoke generated in the carrier heating fluidized bed in step 6) is used to dry the biomass raw material in step 1) for pre-processing the biomass raw material. 
     
     
       6. The method of  claim 1 , wherein the pre-processing of the biomass raw material in step 1) comprises: crushing the biomass raw material to have particle sizes of 1-6 mm, and drying the raw material till water content is 10-20 wt. %.